Battery charger



FIG. 1 is a perspective view of a battery charger showing our new design;

FIG. 2 is a front view of the design;

FIG. 3 is a rear view of the design;

FIG. 4 is a left side view of the design;

FIG. 5 is a right side view of the design;

FIG. 6 is a top view of the design; and,

FIG. 7 is a bottom view of the design.

The broken lines showing the remaining portion of the battery charger in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

The ornamental design for a battery charger, as shown and described. 